I have been driving this car for some time now (Ford Focus ZX4 2005). I have been seeing 25 - 27 MPG every time I fill up. I drive a little (10 min) in city and then the rest of my destination on the highway (20 min). I have a OBDII reader and Torque Pro and I gathered Bank 1 Sensor 1 and 2 as well as Short and Long Term Fuel Trim. NOT sure if the program is under-sampling.
So looking from the graph above... can you guys make assumptions on weather or not my O2 sensor are functioning or if you can see something else let me know.
I have been watching lots of videos on O2 sensors as well fuel trim banks stuff. BUT I am no position to make guesses on my car. BUT if there is something wrong and can improve my MPG I will be happy :D. If not, I will end my search and live with it. Thanks in advance.